package com.example.lotterysystem.service.activitystatus.impl;

import com.example.lotterysystem.common.errorcode.ServiceErrorCodeConstants;
import com.example.lotterysystem.common.exception.ServiceException;
import com.example.lotterysystem.service.ActivityService;
import com.example.lotterysystem.service.activitystatus.ActivityStatusManager;
import com.example.lotterysystem.service.activitystatus.operator.AbstractActivityOperator;
import com.example.lotterysystem.service.dto.ConvertActivityStatusDTO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * @auther falls_vc
 * description:
 * @date 2025/9/13  15:30
 */
@Component
public class ActivityStatusManagerImpl implements ActivityStatusManager {

    private static final Logger logger = LoggerFactory.getLogger(ActivityStatusManagerImpl.class);
    @Autowired
    private final Map<String, AbstractActivityOperator> operatorMap =new HashMap<>();
    @Autowired
    private ActivityService activityService;
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void handlerEvent(ConvertActivityStatusDTO convertActivityStatusDTO) {
        // 维护依赖条件 先后处理

        if(CollectionUtils.isEmpty(operatorMap)) {
            logger.warn("operatorMap 为空！");
            return;
        }

        // map<String, AbstractActivityOperator>
        Map<String, AbstractActivityOperator> currMap = new HashMap<>(operatorMap);

        Boolean update = false;
        // 先处理： 人员 奖品
        update = processConvertStatus(convertActivityStatusDTO,currMap,1);
        // 后处理： 活动

        update = processConvertStatus(convertActivityStatusDTO,currMap,2) || update;

        // 更新缓存
        if(update) {
            activityService.cacheActivity(convertActivityStatusDTO.getActivityId());
        }

    }

    @Override
    public void rollbackHandlerEvent(ConvertActivityStatusDTO convertActivityStatusDTO) {
        //  回滚状态
        for(AbstractActivityOperator operator : operatorMap.values()) {

            operator.convert(convertActivityStatusDTO);
        }
        // 缓存
        activityService.cacheActivity(convertActivityStatusDTO.getActivityId());

    }

    private Boolean processConvertStatus(ConvertActivityStatusDTO convertActivityStatusDTO,
                                         Map<String, AbstractActivityOperator> currMap,
                                         int sequence) {
        Boolean update = false;
        // 遍历currMap
        Iterator<Map.Entry<String, AbstractActivityOperator>> iterator = currMap.entrySet().iterator();
        while (iterator.hasNext()) {
            AbstractActivityOperator operator = iterator.next().getValue();
            // Operator 是否需要转换
            if (operator.sequence() != sequence
                || !operator.needConvert(convertActivityStatusDTO)) {
                continue;
            }
            // 转换
            if(!operator.convert(convertActivityStatusDTO)){
                logger.info("{}状态转换失败！",operator.getClass().getName());
                throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_STATUS_CONVERT_ERROR);
            }
            // currMap 删除当前Operator
            iterator.remove();
            update = true;
        }

        // 返回
        return update;
    }
}
